/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --cyber-cyan: #00F0FF;
      --race-red: #FF003C;
      --light-bg: #F5F5F7;
      --white: #FFFFFF;
      --dark-card: #1A1F3A;
      --text-primary: #1D1D1F;
      --text-secondary: #6E6E73;
      --text-light: #CCCCCC;
      --border-light: rgba(0, 240, 255, 0.25);
      --shadow-card: 0 12px 28px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.02);
      --shadow-neon: 0 12px 32px rgba(0,240,255,0.15);
      --radius-card: 16px;
      --radius-btn: 30px;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', '苹方', system-ui, -apple-system, sans-serif;
      background-color: var(--light-bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 40;
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-text {
      font-size: 1.7rem;
      font-weight: 800;
      color: white;
      letter-spacing: 1px;
      line-height: 1.2;
    }
    .logo-text span {
      color: var(--cyber-cyan);
    }
    .logo-domain {
      font-size: 0.7rem;
      color: #aaa;
      margin-left: 6px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      color: #ccc;
      font-size: 0.95rem;
      font-weight: 500;
      text-decoration: none;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyber-cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--cyber-cyan);
      box-shadow: 0 2px 12px var(--cyber-cyan);
    }
    .nav-cta {
      background: var(--race-red);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: 24px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(255,0,60,0.4);
    }
    .nav-cta:hover {
      background: #e60035;
      transform: scale(1.02);
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 70%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,240,255,0.12) 0%, transparent 70%);
      top: -100px;
      right: -100px;
      animation: floatGlow 10s infinite alternate;
    }
    @keyframes floatGlow {
      0% { transform: translate(0,0); }
      100% { transform: translate(-30px,30px); }
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }
    .hero-text h1 .cyan {
      color: var(--cyber-cyan);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #ddd;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--race-red);
      color: white;
      padding: 14px 34px;
      border-radius: 30px;
      font-weight: 700;
      text-decoration: none;
      transition: 0.2s;
      border: none;
      display: inline-block;
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 0 18px rgba(255,0,60,0.7);
      color: white;
    }
    .btn-outline {
      border: 2px solid var(--cyber-cyan);
      color: var(--cyber-cyan);
      padding: 14px 34px;
      border-radius: 30px;
      font-weight: 700;
      text-decoration: none;
      background: transparent;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: var(--cyber-cyan);
      color: #0A0E27;
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-img-placeholder {
      width: 100%;
      max-width: 500px;
      aspect-ratio: 1/1;
      background: rgba(0,240,255,0.08);
      border-radius: 24px;
      border: 1px solid rgba(0,240,255,0.3);
      backdrop-filter: blur(8px);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--cyber-cyan);
      font-size: 1.2rem;
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 48px;
    }
    /* 核心优势 */
    .features-grid {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .feature-item {
      flex: 1;
      min-width: 200px;
      background: transparent;
      padding: 0;
    }
    .feature-icon {
      font-size: 2.8rem;
      color: var(--cyber-cyan);
      margin-bottom: 16px;
    }
    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.2s;
    }
    .service-card.dark-card {
      background: var(--dark-card);
      color: white;
    }
    .card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .card-content {
      padding: 20px;
    }
    /* 数据区 */
    .stats-section {
      background: var(--dark-card);
      color: white;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--cyber-cyan);
    }
    /* 滚动案例 */
    .scroll-cards {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .case-card {
      min-width: 300px;
      background: white;
      border-radius: 16px;
      overflow: hidden;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 16px;
      border-left: 3px solid var(--cyber-cyan);
    }
    /* CTA */
    .cta-banner {
      background: linear-gradient(120deg, #0A0E27, #5a1a2c);
      text-align: center;
      padding: 80px 0;
    }
    .footer {
      background: #0A0E27;
      color: #ccc;
      padding: 48px 0 24px;
    }
    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: 1fr 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero-text h1 { font-size: 2.4rem; }
    }